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    <title>03_分区元素</title>
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    <h1>kjwhvhsj<span style="color:red;">rijorwwi</span>jwreoijrwoiwroiwoihreoih</h1>
    今天是<span style="color:blue;">2025年8月20日</span>，星期<span style="color:green;">三</span>，天气<span style="color:orange;">晴</span>

    <div>块级分区元素</div>
    <div>块级分区元素</div>
    <div>块级分区元素</div>
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    <div class="header">头部</div>
    <div class="nav">导航</div>
    <div class="main">主体</div>
    <div class="footer">尾部</div>
<!-- 新版本 -->
    <header>头部</header>
    <nav>导航</nav>
    <main>主体</main>
    <footer>尾部</footer>
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